Other notes:
It seems that my colonists get stuck pathfinding outside or in the airlock a lot. Here's a savegame where the issue appeared during gameplay:https://oc.anderdonau.de/index.php/s/8mZBhoV3erYWOUI (Link valid until 2016-07-31).
I have one colonists who spent almost 2% of his air supply in the airlock, another one is walking around outside between the airlock, some bushes, a water still and the airlock and another (now starved) colonist just kept turning in a small circle outside, MAYBE clipped into a droppod.